lwip: Add LwIP-based TCP/IP translator

* Makefile (prog-subdirs): Add lwip.
* config.make.in (HAVE_LIBLWIP, liblwip_CFLAGS, liblwip_LIBS): Define
variables.
* configure.ac: Check for liblwip.
* lwip/: New directory.

1 files changed, 69 insertions, 0 deletions

diff --git a/lwip/startup.c b/lwip/startup.c
new file mode 100644
index 00000000..a21dfe33
--- /dev/null
+++ b/lwip/startup.c
@@ -0,0 +1,69 @@
+/*
+   Copyright (C) 2017 Free Software Foundation, Inc.
+   Written by Michael I. Bushnell, p/BSG.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   The GNU Hurd is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with the GNU Hurd.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <startup.h>
+
+#include <unistd.h>
+#include <hurd/paths.h>
+#include <hurd/startup.h>
+
+#include <lwip-hurd.h>
+
+static void
+sigterm_handler (int signo)
+{
+  ports_class_iterate (socketport_class, ports_destroy_right);
+  ports_class_iterate (addrport_class, ports_destroy_right);
+  sleep (10);
+  signal (SIGTERM, SIG_DFL);
+  raise (SIGTERM);
+}
+
+void
+arrange_shutdown_notification ()
+{
+  error_t err;
+  mach_port_t initport, notify;
+  struct port_info *pi;
+
+  shutdown_notify_class = ports_create_class (0, 0);
+
+  signal (SIGTERM, sigterm_handler);
+
+  /* Arrange to get notified when the system goes down,
+     but if we fail for some reason, just silently give up.  No big deal. */
+
+  err = ports_create_port (shutdown_notify_class, lwip_bucket,
+			   sizeof (struct port_info), &pi);
+  if (err)
+    return;
+
+  initport = file_name_lookup (_SERVERS_STARTUP, 0, 0);
+  if (initport == MACH_PORT_NULL)
+    return;
+
+  notify = ports_get_send_right (pi);
+  ports_port_deref (pi);
+  startup_request_notification (initport, notify,
+				MACH_MSG_TYPE_MAKE_SEND,
+				program_invocation_short_name);
+  mach_port_deallocate (mach_task_self (), notify);
+  mach_port_deallocate (mach_task_self (), initport);
+}